Network Communications—N2 Communications Bus
15
Table 3: Specifications
Category Specification
Product Name
N2 Communications Bus
Error Checking
Module 256 Checksum
Address Range of
Devices
1 to 255*
Number of N2 Devices
Up to 100 (60 to 200 TC-9100s)
Signaling Method
Baseband, 9600 baud, ASCII/Hexadecimal character
Surge Protection
Tested to pass IEEE 587 and 472 waveforms
Termination Method
Network of voltages, biases, and resistors that are
switch selectable.
Note: ASCs are self-terminating and therefore do not
require End-of-Line (EOL) resistors.
Transmission Media
3-wire twisted cable (26 AWG or larger; 22 AWG
recommended)
Two twisted pair telephone cable
Two twisted pair cable with a shield
(All cables listed above can be solid or stranded.)
Optical Fiber
Physical Configuration
Daisy-chained
Distance Between
Devices
Up to 1524 m (5000 ft)
Line Length
Up to 4572 m (15,000 ft) (one repeater per 1524 m
[5000 ft] or 50 devices)
Standard Components
N2 Bus Submodule (NCM-101/102 only)
Communication Terminal Board
Cable
Optional Vendor
Components
N2 Repeater: Acromag 4683-TTM-1 (115 VAC) or
Acromag 4683-TTM-2 (230 VAC)
Note: Repeater required for N2 to support more than
50 devices or runs over 5000 feet.
Surge Protector: Advanced Protection Technologies
Transient Eliminator® TE/JC04C12
Fiber Modem: S.I. Tech 2110 and S.I. Tech 2121
Power Supply
9-pin Male Connector Kit (required by 2110 modem)
* If you have VMAs on the N2 trunk, do not
use addresses 254 or 255.
Specifications
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